The BatteryMINDer temperature sensor can be used to detect and adjust charger's output voltage depending on temperature, extending battery life and performance by more than 100%. Can be used with any 12 or 24 volt battery. Works with models 12248, 12248-AA-S1 (replaced by 12248-AA-S2), 12248-AA-S2, 12248-AA-S3, 24041, 24041-AA-S1 (replaced by 24041-AA-S2), 24041-AA-S2, 24041-AA-S3, 36271 and 48021. Guaranteed to significantly increase your battery's life and performance in the first year, or you get 100% of your money back.